From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mellanox.co.il (mail-il-dmz.mellanox.com [193.47.165.129]) by dpdk.org (Postfix) with ESMTP id 518CB1B8FD for ; Thu, 10 Jan 2019 19:35:38 +0100 (CET) Received: from Internal Mail-Server by MTLPINE1 (envelope-from yskoh@mellanox.com) with ESMTPS (AES256-SHA encrypted); 10 Jan 2019 20:35:33 +0200 Received: from scfae-sc-2.mti.labs.mlnx (scfae-sc-2.mti.labs.mlnx [10.101.0.96]) by labmailer.mlnx (8.13.8/8.13.8) with ESMTP id x0AIZU9D030124; Thu, 10 Jan 2019 20:35:31 +0200 From: Yongseok Koh To: olivier.matz@6wind.com, shahafs@mellanox.com Cc: dev@dpdk.org, roszenrami@gmail.com, david.marchand@redhat.com Date: Thu, 10 Jan 2019 10:35:27 -0800 Message-Id: <20190110183528.42503-1-yskoh@mellanox.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20190109085426.39965-1-yskoh@mellanox.com> References: <20190109085426.39965-1-yskoh@mellanox.com> Subject: [dpdk-dev] [PATCH v3 1/2] mbuf: add function returning default buffer address X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 10 Jan 2019 18:35:38 -0000 This patch introduces two new functions - rte_mbuf_buf_addr() and rte_mbuf_data_addr_default(). rte_mbuf_buf_addr() reutrns the default buffer address of given mbuf which comes after mbuf structure and private data. rte_mbuf_data_addr_default() returns the default address of mbuf data taking the headroom into account. Signed-off-by: Yongseok Koh --- v3: * rename functions v2: * initial implementation lib/librte_mbuf/rte_mbuf.h | 43 ++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 40 insertions(+), 3 deletions(-) diff --git a/lib/librte_mbuf/rte_mbuf.h b/lib/librte_mbuf/rte_mbuf.h index bc562dc8a9..486566fc28 100644 --- a/lib/librte_mbuf/rte_mbuf.h +++ b/lib/librte_mbuf/rte_mbuf.h @@ -788,8 +788,47 @@ rte_mbuf_from_indirect(struct rte_mbuf *mi) } /** + * Return the default buffer address of the mbuf. + * + * @param mb + * The pointer to the mbuf. + * @param mp + * The pointer to the mempool of the mbuf. + * @return + * The pointer of the mbuf buffer. + */ +static inline char * __rte_experimental +rte_mbuf_buf_addr(struct rte_mbuf *mb, struct rte_mempool *mp) +{ + char *buffer_addr; + + buffer_addr = (char *)mb + sizeof(*mb) + rte_pktmbuf_priv_size(mp); + return buffer_addr; +} + + +/** + * Return the default address of the beginning of the mbuf data. + * + * @param mb + * The pointer to the mbuf. + * @return + * The pointer of the beginning of the mbuf data. + */ +static inline char * __rte_experimental +rte_mbuf_data_addr_default(struct rte_mbuf *mb) +{ + return rte_mbuf_buf_addr(mb, mb->pool) + RTE_PKTMBUF_HEADROOM; +} + +/** * Return the buffer address embedded in the given mbuf. * + * Note that accessing mempool pointer of a mbuf is expensive because the + * pointer is stored in the 2nd cache line of mbuf. If mempool is known, it + * is better not to reference the mempool pointer in mbuf but calling + * rte_mbuf_buf_addr() would be more efficient. + * * @param md * The pointer to the mbuf. * @return @@ -798,9 +837,7 @@ rte_mbuf_from_indirect(struct rte_mbuf *mi) static inline char * rte_mbuf_to_baddr(struct rte_mbuf *md) { - char *buffer_addr; - buffer_addr = (char *)md + sizeof(*md) + rte_pktmbuf_priv_size(md->pool); - return buffer_addr; + return rte_mbuf_buf_addr(md, md->pool); } /** -- 2.11.0